/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {defineComponent, ref, inject} from 'vue'
import Styles from './dag.module.scss'
import {useCanvasInit, useCellActive} from './dag-hooks'

export default defineComponent({
    name: 'workflow-dag-canvas',
    emits: ['drop'],
    setup(props, context) {
        const readonly = inject('readonly', ref(false))
        const graph = inject('graph', ref())

        const {paper, minimap, container} = useCanvasInit({readonly, graph})

        // Change the style on cell hover and select
        useCellActive({graph})
        const preventDefault = (e: DragEvent) => {
            e.preventDefault()
        }

        return () => (
            <div
                ref={container}
                class={[Styles.canvas, 'dag-container']}
                onDrop={(e) => {
                    context.emit('drop', e)
                }}
                onDragenter={preventDefault}
                onDragover={preventDefault}
                onDragleave={preventDefault}
            >
                <div ref={paper} class={Styles.paper}></div>
                <div ref={minimap} class={Styles.minimap}></div>
            </div>
        )
    }
})
